Pavel Yaskevich 60d931612c [Dignostics] Diagnose weak declarations with non-optional types ...

Diagnose situations where `weak` attribute is used with a non-optional type
in declaration e.g. `weak var x: <Type>`:

```swift
class X {
}

weak var x: X = ...
```

`weak` declaration is required to use an optional type e.g. `X?`.

2021-09-07 17:36:56 -07:00

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